Replace Mainspring

[DouglasSkinner]

I have an A. Schild watch movement with a broken mainspring.  Searching around I found that the Marathon No. 745 is the right replacement.  The numbers are as follows: 7 x 11 10 1/3 which I assume mean:

 

Dennison width: 7

Dennison strength: 11

Dennison length: 10 1/3

 

However what I'm calling the Dennison strength could actually be the Dennison length, not sure.

 

There are two other numbers on the Marathon 745: 1.6 x 10  which I take to mean:

 

Metric Width: 1.6 mm

Metric Strength: 10

 

1) Is my interpretation right?

2) Would a spring with the following be a proper replacement?

 

Dennison width: 7

Dennison strength: 11

Length in inches: 10.5

 

 

[bobm12]

Maybe ofrei has the spring by movement and this will clarify what it is all about...for both of us?! Try and give them a call, they can be very helpful if you get them in a happy mood...I mean sometimes! :)

 

Cheers,

 

Bob